From b396966c4688522863572927cb30aa874b3ec504 Mon Sep 17 00:00:00 2001
From: Phil Oester <kernel@linuxace.com>
Date: Wed, 12 Jun 2013 10:58:20 +0200
Subject: netfilter: xt_TCPMSS: Fix missing fragmentation handling
Similar to commit bc6bcb59 ("netfilter: xt_TCPOPTSTRIP: fix
possible mangling beyond packet boundary"), add safe fragment
handling to xt_TCPMSS.
Signed-off-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/xt_TCPMSS.c | 4 ++++
1 file changed, 4 insertions(+)
(limited to 'net')
diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c
index 6640a224f9fb..7011c71646f0 100644
--- a/net/netfilter/xt_TCPMSS.c
+++ b/net/netfilter/xt_TCPMSS.c
@@ -57,6 +57,10 @@ tcpmss_mangle_packet(struct sk_buff *skb,
u16 newmss;
u8 *opt;
+ /* This is a fragment, no TCP header is available */
+ if (par->fragoff != 0)
+ return XT_CONTINUE;
+
if (!skb_make_writable(skb, skb->len))
return -1;
--
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